ESP32 as wifi co processor with sockets & requests library

[ladyada]

ready for consumption!

[jerryneedell]

@ladyada Where can we get the SPI WiFi firmware for the ESP32?

[ladyada]

here for now :)
https://github.com/ladyada/CircuitPython_WiFi_Demos/tree/master/esp32program

[jerryneedell]

Can this be used with a feather nrf52840 express or feather m4 express and an external ESP32 or dos it have to be used with a NINA-102 module? If so ,
what pins on the ESP32 are used for the interface?
MISO
MOSI
SCK
CS
BUSY
RESET
GPIO0

[jerryneedell]

It's not clear how I can try this out with out the pyportal board or without a way to generate the ESP32 firmware for the WROOOM board. If you have any suggestions, please let me know and I'll be happy to try.

[jerryneedell]

I am testing this on a feather_nrf52840 connected to an ESPRESSIF ESP32 devkit (WROOM) board.
Off to a good start.
A few first observations.
I am able to get it to communicate and connect to my network.

I tried the simpletest and get this error on the Ping

IP lookup adafruit.com: 104.20.38.240
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "esp32spi_nrf.py", line 32, in <module>
  File "adafruit_esp32spi/adafruit_esp32spi.py", line 469, in ping
  File "adafruit_esp32spi/adafruit_esp32spi.py", line 295, in _send_command_get_response
  File "adafruit_esp32spi/adafruit_esp32spi.py", line 183, in _send_command
TypeError: object of type 'int' has no len()
>>> 

I commented out the ping and it passes the other tests:

Press any key to enter the REPL. Use CTRL-D to reload.
Adafruit CircuitPython 4.0.0-beta.2-23-g72f0783b6 on 2019-02-07; Adafruit Feather nRF52840 Express with nRF52840
>>> 
>>> import esp32spi_nrf
ESP32 SPI webclient test
ESP32 found and in idle mode
Firmware vers. bytearray(b'1.2.1\x00')
MAC addr: ['0x84', '0xb6', '0xdf', '0xa4', '0xae', '0x30']
SSID names: [bytearray(b'Needell Airport'), bytearray(b'Needell Airport'), bytearray(b'Needell Airport'), bytearray(b'Needell Airport'), bytearray(b'xfinitywifi'), bytearray(b' A31A')]
APs:  [{'ssid': bytearray(b'Needell Airport'), 'rssi': -35, 'encryption': 4}, {'ssid': bytearray(b'Needell Airport'), 'rssi': -58, 'encryption': 4}, {'ssid': bytearray(b'Needell Airport'), 'rssi': -72, 'encryption': 4}, {'ssid': bytearray(b'Needell Airport'), 'rssi': -72, 'encryption': 4}, {'ssid': bytearray(b'xfinitywifi'), 'rssi': -80, 'encryption': 7}, {'ssid': bytearray(b' A31A'), 'rssi': -90, 'encryption': 4}]
Connecting to AP...
Connected to bytearray(b'Needell Airport') RSSI -34
My IP address is 10.0.0.72
IP lookup adafruit.com: 104.20.38.240
Fetching text from http://wifitest.adafruit.com/testwifi/index.html
This is a test of the CC3000 module!
If you can read this, its working :)
Fetching json from http://api.coindesk.com/v1/bpi/currentprice/USD.json
{'time': {'updated': 'Feb 10, 2019 13:08:00 UTC', 'updatedISO': '2019-02-10T13:08:00+00:00', 'updateduk': 'Feb 10, 2019 at 13:08 GMT'}, 'disclaimer': 'This data was produced from the CoinDesk Bitcoin Price Index (USD). Non-USD currency data converted using hourly conversion rate from openexchangerates.org', 'bpi': {'USD': {'code': 'USD', 'description': 'United States Dollar', 'rate_float': 3621.382, 'rate': '3,621.3817'}}}
Done!

For some reason - every other time I try to connect, it has trouble finding my network, but if I reboot and try again it works.
This appears to be repeatable... always works on the second try.

Press any key to enter the REPL. Use CTRL-D to reload.
Adafruit CircuitPython 4.0.0-beta.2-23-g72f0783b6 on 2019-02-07; Adafruit Feather nRF52840 Express with nRF52840
>>> 
>>> 
>>> import esp32spi_nrf
ESP32 SPI webclient test
ESP32 found and in idle mode
Firmware vers. bytearray(b'1.2.1\x00')
MAC addr: ['0x84', '0xb6', '0xdf', '0xa4', '0xae', '0x30']
SSID names: [bytearray(b'Needell Airport'), bytearray(b'Needell Airport'), bytearray(b'Needell Airport'), bytearray(b'Needell Airport'), bytearray(b'xfinitywifi'), bytearray(b'xfinitywifi'), bytearray(b'Jquighome'), bytearray(b' A31A')]
APs:  [{'ssid': bytearray(b'Needell Airport'), 'rssi': -36, 'encryption': 4}, {'ssid': bytearray(b'Needell Airport'), 'rssi': -57, 'encryption': 4}, {'ssid': bytearray(b'Needell Airport'), 'rssi': -71, 'encryption': 4}, {'ssid': bytearray(b'Needell Airport'), 'rssi': -76, 'encryption': 4}, {'ssid': bytearray(b'xfinitywifi'), 'rssi': -83, 'encryption': 7}, {'ssid': bytearray(b'xfinitywifi'), 'rssi': -86, 'encryption': 7}, {'ssid': bytearray(b'Jquighome'), 'rssi': -87, 'encryption': 4}, {'ssid': bytearray(b' A31A'), 'rssi': -88, 'encryption': 4}]
Connecting to AP...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "esp32spi_nrf.py", line 28, in <module>
  File "adafruit_esp32spi/adafruit_esp32spi.py", line 437, in connect_AP
RuntimeError: ('No such ssid', b'Needell Airport')
>>> 

[jerryneedell]

the ping fails because the "params" sent is a 4 integer bytearray - returned by get_host_by_name and when the array is enumerated each value is an integer so the len(param) fails in send_command.

there were recent changes at line 183 (send_command)
was something changed to break ping?

[jerryneedell]

regarding the connect failures, it is repeatable -- If it is connected then reset, the next attempt to connect fails. Attempting to connect again passes...

>>> esp.connect_AP(b'Needell Airport', b'mypass')
3
>>> esp.connect_AP(b'Needell Airport', b'mypass')
3
>>> esp.reset()
>>> esp.connect_AP(b'Needell Airport', b'mypass')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "adafruit_esp32spi/adafruit_esp32spi.py", line 437, in connect_AP
RuntimeError: ('No such ssid', b'Needell Airport')
>>> esp.connect_AP(b'Needell Airport', b'mypass')
3
>>> esp.connect_AP(b'Needell Airport', b'mypass')
3
>>> esp.reset()
>>> esp.connect_AP(b'Needell Airport', b'mypass')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "adafruit_esp32spi/adafruit_esp32spi.py", line 437, in connect_AP
RuntimeError: ('No such ssid', b'Needell Airport')
>>> esp.connect_AP(b'Needell Airport', b'mypass')
3
>>> 

[jerryneedell]

cool! cheerlights works!

Fetching json from http://api.thingspeak.com/channels/1417/feeds.json?results=1
*** Get host by name
*** Get socket
Allocated socket #0
*** Socket connect mode 0
*** Open socket
Writing: b'GET /channels/1417/feeds.json?results=1 HTTP/1.0\r\n'
Writing: b'Host: api.thingspeak.com\r\n'
Writing: b'User-Agent: Adafruit CircuitPython\r\n'
Writing: b'\r\n'
ESPSocket: 0 bytes available
ESPSocket: 0 bytes available
ESPSocket: 0 bytes available
ESPSocket: 0 bytes available
ESPSocket: 0 bytes available
ESPSocket: 0 bytes available
ESPSocket: 0 bytes available
ESPSocket: 0 bytes available
ESPSocket: 1236 bytes available
Reading 1236 bytes from ESP socket with status 4
ESPSocket: 0 bytes available
{'channel': {'field1': 'Last CheerLights Command', 'last_entry_id': 532346, 'longitude': '-80.22', 'updated_at': '2018-07-20T01:05:15Z', 'name': 'CheerLights', 'created_at': '2011-12-01T03:30:04Z', 'id': 1417, 'field2': 'CheerLights HEX Color', 'latitude': '40.5', 'description': 'CheerLights is an \u201cInternet of Things\u201d project created by Hans Scharler that allows people\u2019s lights all across the world to synchronize to one color set by Twitter. This is a way to connect physical things with social networking experiences.'}, 'feeds': [{'created_at': '2019-02-10T17:01:03Z', 'field2': '#FFC0CB', 'field1': 'pink', 'entry_id': 532346}]}
[{'created_at': '2019-02-10T17:01:03Z', 'field2': '#FFC0CB', 'field1': 'pink', 'entry_id': 532346}]
{'created_at': '2019-02-10T17:01:03Z', 'field2': '#FFC0CB', 'field1': 'pink', 'entry_id': 532346}
#FFC0CB
Done!

[ladyada]

latest commit removes need for GPIO0 and also fixes ping

[jerryneedell]

I don't get errors from ping, but I also don't get responses...

Ping google.com: 65535 ms
Ping google.com: 65535 ms
Ping google.com: 65535 ms

[jerryneedell]

hmmm -- nevermind

Ping adafruit.com: 20 ms
Ping google.com: 30 ms

used the updated example -- not sure what changed, but it works now ...

[jerryneedell]

FYI -- I started using this to workaround the failed connects -- seems to work well:

while not esp.is_connected:
    try:
        print("Connecting to AP...")
        esp.connect_AP(b'Needell Airport', b'browndog')
    except (ValueError, RuntimeError) as e:
        print("Failed to connect, retrying\n", e)
        continue

[ladyada]

@jerryneedell kk you feel this is ok to merge/release for now then?

[jerryneedell]

Yes. Go for it! I’ve done some posts to AIO and have been running cheer lights for hours.